We have an old Windows 2003 server that acts as a secondary DNS and Global Catalog server. It is quie old and we have a new server with Windows 2012 R2 installed that we would like to be the new secondary DNS and Global Catalog server. We are trying to get the best steps on how to do this.
For example do we have promo the 2003 server down first and then add the 2012 server with the new features or will adding the 2012 with DNS first and then promoting the 2003 server down after this cause issues? Any assistance offered would be greatly appreciated.